a fully integrated energy storage & management solution with Sol-Ark equipment

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SimpliPhi Power’s AccESS™ with PHI™ 3.8kWh batteries and Sol-Ark inverter is a fully integrated and pre-programmed energy storage and management solution. With 22.8kWh of total capacity, the AccESS keeps the lights on and lowers utility bills, creating peace of mind for homeowners and businesses.

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  • Description
  • Specifications
  • Documentation
  • Video


The AccESS PHI supports a wide variety of applications, and multiple generation sources: Solar, Wind, Hydro, Grid or Generators. Maximize solar PV generation by storing excess power for critical backup, evening hours and daily self-consumption to offset Time-Of-Use rates. Net-Metered customers can add energy storage to existing grid-tied solar systems for standby power or energy arbitrage. Off-grid customers can take advantage of integrated MPPT charge controls to create stand-alone systems for whole-home power and generator optimization with auto start capabilities. Create resilience, energy security and daily cost savings with 98% efficient, safe and reliable access to power – 24/7.

SimpliPhi Power designs and manufactures efficient, non-toxic and enduring energy storage and management systems that utilize lithium ferro phosphate (LFP). Based in California, SimpliPhi combines non-hazardous LFP chemistry with its proprietary cell and battery architecture, power electronics, battery management system (BMS) and manufacturing methods to create safe, reliable, durable and highly scalable on-demand power solutions. Available for the residential, commercial, military and emergency response markets, SimpliPhi storage solutions have been rigorously tested and passed operational performance requirements by the U.S. Army and Marine Corps. Integral to all SimpliPhi solutions is a proprietary management system that further optimizes the life-cycle, round-trip efficiency rate, performance and durability of its batteries. SimpliPhi PHI 3.8 kWh 48V 60 Amp batteries are Certified to UL 1973 Standard.

Internal transfer switch automatically disconnects from the grid during power outages and provides standby power for critical circuits
Outdoor rated enclosure can be free-standing, or pad-mounted
Advanced LFP batteries with a 10,000 cycle / 10-year warranty
98% round trip efficiency
Remote monitoring by web browser or mobile device app
No cobalt , thermal regulation, cooling, or risk of fire
Extended operating temperature
Solar MPPT for DC-coupled or off-grid installations
Automatic Generator control for additional standby power
SIA (Standard Interconnection Agreement) customers: AccESS allows for solar PV power to be stored in batteries for a backup power source, or for self-consumption during evenings or other set times.
NEM (Net Energy Metering) customers: Add energy storage to an existing net-metered solar array for standby power or energy arbitrage purposes.
Off-grid customers: Up to 12 kW Solar MPPT combines power generation and energy management in a single package.
Disaster recovery customers: Reliable, 98% efficient, non-toxic backup power in the event of a power outage.


“After Hurricane Maria hit PR, SimpliPhi made our transition to solar energy a breeze. Now our guesthouse is always energized and environmentally friendly”
Harmony Guesthouse, Puerto Rico – August 2018


Dimensions (W x H x D)29.5” W x 76”H (w/feet) x 20” D / 75 cm W x 193 cm H x 51 cm D
Weight600 lb (272.16 kg) (w/out batteries)
Enclosure RatingNEMA 3R Outdoor rated
Operating Temperature-4°F to 122°F (-20°C to 50°C)
MountingFree-standing or Pad-mounted
Enclosure Warranty Period2 years
CertificationsUL1741SA Rule 21, HECO Rule 14H, PREPA approved and Rapid Shutdown compliant Included batteries ETL certified and certified to UL 1973
Sol-ArkSol-Ark 12K
ApplicationOn or Off-Grid
AC Connections1 Bi-Directional Grid Port (50A double-pole), 1 Bi-Directional Generator Port (40A double-pole), 1 UPS Load Output (50A double-pole)
Output Frequency (selectable)60 Hz or 50 Hz
Output VoltageL-N: 120VAC; L-L: 240VAC │ L-L: 208VAC (2/3 phases) │ 230VAC
Off-Grid Output Power System8 kW Continuous
Solar PV Continuous Power12 kW
Inverter AC Continuous Power9 kW
Inverter Battery Continuous PowerTo grid: 9 kW, To load: 8 kW
Max Output Charging Current185 ADC
CEC Weighted Efficiency96.5%
Warranty Period10 yr optional extended
Parallel StackingNo
Other FeaturesEMP hardened upon request (against Nuclear EMP and Solar Flare), Smart Load capabilities (CTs included)
Solar PV
DC Coupled
Sol-Ark Dual MPPT1 – 4 PV String Inputs (2 max per MPPT)
Max Connected PV Power16.5 kW (8 kW max per MPPT) 12 kW max simultaneous utilization
Min PV Array Starting Voltage150 VDC
Max Open Circuit PV Array Voltage500 Voc per PV String
MPPT Voltage Range150 – 425 VDC
Max Array Short Circuit Current33A per MPPT
Max Array Operating Current20A per MPPT
AC Coupled
Max AC Coupled Input7.6 kW (string or micro-inverters)
DC & AC Coupled
Max Combined Solar Input (DC + AC)16.5 kW
Best Combined Input Combination3 kW AC + 12 kW DC
Good Combined Input Combination4 kW AC + 11 kW DC
OK Combined Input Combination5 – 7.6 kW AC + 9 – 7 kW DC
1 kW AC + 15 kW DC
Other Features
Internet Connected
Computer or Phone App
PowerView ES Monitor and Programming
Automatic Generator StartTwo-Wire Automatic Generator Start
SimpliPhi Power(x6) PHI 3.8 kWh-48V
Rated kWh Capacity @ C/222.8 kWh
Usable kWh Capacity @ 80% DoD18.24 kWh
Max Combined Output Power11.4 kWh
Max Combined Charge Current225 ADC
Charging Temperature32°F to 120°F (0°C to 49°C)
Depth of Discharge3up to 100% DoD
Round Trip Efficiency98%
Cycle Life10,000+ (@ 80% DOD)
Warranty Period10 years

Specifications are typical/nominal. Subject to change without notice.

  • UN3480, Lithium Ion batteries, 9, II
  • UL and CE listed, UN/DOT and RoHS compliant components
  • Manufactured in the United States


The AccESS Sol-Ark Quick Start Video